Hitoshi Hirose, Youichi Asano, Kazushige Obara, and Takanori Matsuzawa (2014),
A coherent occurrence of slow earthquakes around the Bungo Channel area and Its implication for seismic hazard assessment,
Report of Research Center for Urban Safety and Security Kobe University, 18, 16-22.

Takanori Matsuzawa, and Hiroyuki Kumagai (2013),
Very long period seismic signal excited around Miyake Island in January, 2013,
Report of the Coordinating Committee for Prediction of Volcanic Eruption, 114, 114-115.

Takanori Matsuzawa, and Youichi Asano (2010),
The earthquakes off Shikoku in July, 2009: Very low frequency earthquakes around these events,
Report of the Coordinating Committee for Earthquake Prediction, 83, 455-457.